Passage 2
 In previous recessions, billionaires were hit along with the rest of us； it took almost three years for Forbes's 400richest people to recover losses incurred in 2008's Great Recession. But in the coronavirus recession of 2020, mostbillionaires have not lost their shirts. Instead, they've put on bejeweled overcoats and gloves made of spun goldthat is, they've gotten richer than ever before.Billionaires amassed their new billions just as millions of other Americans plunged into dire financial straits. Morethan 20 million people lost their jobs at the start of the pandemic. Food banks across the country are bracing foranother surge in demand. Why are American billionaires doing so well while so many other Americans suffer? Partof the story is garden-variety American inequality. Stocks are overwhelmingly owned by the wealthy, and the stockmarket has recovered from its early-pandemic depths much more quickly than other parts of the economy.
 But some billionaires are also benefiting from economic and technological trends that were accelerated by thepandemic. Among these are the owners and investors of retail giants like Amazon, Walmart, Target, Dollar Tree andDollar General, which have reported huge profits this year while many of their smaller competitors were clobberedas the coronavirus spread. Then there are companies that have bet on the rapid digitization of everything. Eric Yuan, the chief executive ofZoom, became a billionaire in 2019. Now he is worth almost $20 billion. Apoorva Mehta, the founder of the grocery-delivery company Instacart, was not a billionaire last year； this year, after a spike in orders that led to a new roundof investment that pumped up the value of his company, he's safely in the club. Dan Gilbert, the chairman of QuickenLoans, was worth less than $7 billion in March； now he commands more than $43 billion. But like in the rest of theeconomy, there is a great deal of stratification even among billionaires -richer billionaires got even richer in 2020than the poorer ones did. Some of the numbers are staggering. Jeff Bezos, Amazon's founder, was worth about $113 billion at the start of thebandemic. Now he is worth S182 billion - an increase of about S69 billion. Jim, Alice and Rob Walton, three ofthe largest shareholders of Walmart, saw their combined wealth grow by $47 billion during the pandemic. Two yearsago, Bezos was the only "centibillionaire" on carth- the trendy neologism for people whose wealth exceeds $100billion. (Modified from https://www.nytimes.com/2020/11/25/opinion/coronavirus-billionaires.htm1?searchResultPosition=2)
【題組】31. What is this reading mainly about?
(A)Even in a pandemic, 400 richest people recovered from losses.
(B) Even in a pandemic, the richest kept getting richer.
(C) The stock market has recovered before the pandemic started.
(D) Food banks are sufficient in the United States.